on pro mini:

0   rxd    rxd
1   txd    txd

2   pd2
3   pd3


4   pd4
5   pd5
6   pd6
7   pd7

8   pb0    Data 0
9   pb1    Data 1
10  pb2


11  pb4
12  pb3
13  pb5


A0  pc0    LCD D0
A1  pc1    LCD D1
A2  pc2    LCD D2
A3  pc3    LCD D3

A4  pc4    LCD RS
A5  pc5    LCD /E


A6  adc6
A7  adc7

LCD R/W goes to ground
LCD Vlcd goes to 0-5V contrast pot.


position 	1 	2 	3 	4 	5 	6 	7 	8 	9 	10 	11 	12 	13 	14 	15 	16
line 1 		0 	1 	2	3 	4 	5	6 	7 	40      41      42      43      44      45      46      47



*/
#include <avr/io.h>
#include "usart.h"
#include <avr/interrupt.h>
#include "lcd.h"

#define NOP()                 asm volatile ("nop"::)
#define OUTPUT  1
#define INPUT   0

#define SetBit(BIT, PORT)     PORT |= (1<<BIT)
#define ClearBit(BIT, PORT)   PORT &= ~(1<<BIT)
#define IsHigh(BIT, PORT)    (PORT & (1<<BIT)) != 0
#define IsLow(BIT, PORT)     (PORT & (1<<BIT)) == 0
#define InBoundsI(v, l, h)        ((v) >= (h)) ? (0) : ((v) <= (l)) ? (0) : (1)


#define waitswipe()          while((PINB & 0x03) == 0x03)

unsigned long readCode(void);

int main( void ) {

  unsigned int   i;
  unsigned long  capture;
  unsigned int   facility;
  unsigned int   serial;


    // set up directions
  DDRB = (INPUT << PB0 | INPUT << PB1 | INPUT << PB2 |INPUT << PB3 |INPUT << PB4 |INPUT << PB5 |INPUT << PB6 |INPUT << PB7);
  DDRD = (INPUT << PD0 | INPUT << PD1 | INPUT << PD2 |INPUT << PD3 |INPUT << PD4 |INPUT << PD5 |INPUT << PD6 |INPUT << PD7);
  DDRC = (OUTPUT << PC0 | OUTPUT << PC1 | OUTPUT << PC2 |OUTPUT << PC3 |OUTPUT << PC4 |OUTPUT << PC5 |INPUT << PD6 |INPUT << PD7);

  PORTB = 0x0C;
  lcd_init();

  lcd_goto(0);
  lcd_putstr("Ready");

  for ( i = 0; i < 65534; i++) NOP(); // startup delay for screen

  lcd_cls();
  lcd_putstr("Ready");

    while(1) {
      waitswipe();
      capture = readCode();

      facility = (capture >> 16) & 255;
      serial   = capture &  0xFFFF;

      lcd_goto(0);
      lcd_putstr("F:");
      print3(facility);
      lcd_goto(40);
      lcd_putstr("SN:");
      print5(serial);

    }

}


//------------------------| FUNCTIONS |------------------------



unsigned long readCode(void) {

  unsigned long data;
  unsigned long timeout;

  data = 0;
  while(1) {

    for(timeout = 2000*8; ((timeout != 0) && (( PINB & 0x03) == 0x03)); timeout--);

    if (timeout != 0) {
      if (PINB & 0x01) {
        data |= 0x01;
      }
      data <<= 1;
      while((PINB & 0x03) != 0x03);
    } else {
       return data >> 2 ;
    }
  }
}